1 /*
2 * Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciCallProfile.hpp"
27 #include "ci/ciExceptionHandler.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciMethod.hpp"
30 #include "ci/ciMethodBlocks.hpp"
31 #include "ci/ciMethodData.hpp"
32 #include "ci/ciStreams.hpp"
33 #include "ci/ciSymbol.hpp"
34 #include "ci/ciReplay.hpp"
35 #include "ci/ciSymbols.hpp"
36 #include "ci/ciUtilities.inline.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/methodLiveness.hpp"
39 #include "interpreter/interpreter.hpp"
40 #include "interpreter/linkResolver.hpp"
41 #include "interpreter/oopMapCache.hpp"
42 #include "memory/allocation.inline.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/generateOopMap.hpp"
45 #include "oops/method.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "prims/methodHandles.hpp"
48 #include "runtime/deoptimization.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "utilities/bitMap.inline.hpp"
51 #include "utilities/xmlstream.hpp"
52 #ifdef COMPILER2
53 #include "ci/bcEscapeAnalyzer.hpp"
54 #include "ci/ciTypeFlow.hpp"
55 #include "oops/method.hpp"
56 #endif
57
58 // ciMethod
59 //
60 // This class represents a Method* in the HotSpot virtual
61 // machine.
62
63
64 // ------------------------------------------------------------------
65 // ciMethod::ciMethod
66 //
67 // Loaded method.
68 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
69 ciMetadata(h_m()),
70 _holder(holder)
71 {
72 assert(h_m() != NULL, "no null method");
73 assert(_holder->get_instanceKlass() == h_m->method_holder(), "");
74
75 if (LogTouchedMethods) {
76 h_m->log_touched(Thread::current());
77 }
78 // These fields are always filled in in loaded methods.
79 _flags = ciFlags(h_m->access_flags());
80
81 // Easy to compute, so fill them in now.
82 _max_stack = h_m->max_stack();
83 _max_locals = h_m->max_locals();
84 _code_size = h_m->code_size();
85 _intrinsic_id = h_m->intrinsic_id();
86 _handler_count = h_m->exception_table_length();
87 _size_of_parameters = h_m->size_of_parameters();
88 _uses_monitors = h_m->access_flags().has_monitor_bytecodes();
89 _balanced_monitors = !_uses_monitors || h_m->access_flags().is_monitor_matching();
90 _is_c1_compilable = !h_m->is_not_c1_compilable();
91 _is_c2_compilable = !h_m->is_not_c2_compilable();
92 _can_be_parsed = true;
93 _has_reserved_stack_access = h_m->has_reserved_stack_access();
94 _is_overpass = h_m->is_overpass();
95 // Lazy fields, filled in on demand. Require allocation.
96 _code = NULL;
97 _exception_handlers = NULL;
98 _liveness = NULL;
99 _method_blocks = NULL;
100 #if defined(COMPILER2)
101 _flow = NULL;
102 _bcea = NULL;
103 #endif // COMPILER2
104
105 ciEnv *env = CURRENT_ENV;
106 if (env->jvmti_can_hotswap_or_post_breakpoint()) {
107 // 6328518 check hotswap conditions under the right lock.
108 MutexLocker locker(Compile_lock);
109 if (Dependencies::check_evol_method(h_m()) != NULL) {
110 _is_c1_compilable = false;
111 _is_c2_compilable = false;
112 _can_be_parsed = false;
113 }
114 } else {
115 DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
116 }
117
118 if (h_m->method_holder()->is_linked()) {
119 _can_be_statically_bound = h_m->can_be_statically_bound();
120 _can_omit_stack_trace = h_m->can_omit_stack_trace();
121 } else {
122 // Have to use a conservative value in this case.
123 _can_be_statically_bound = false;
124 _can_omit_stack_trace = true;
125 }
126
127 // Adjust the definition of this condition to be more useful:
128 // %%% take these conditions into account in vtable generation
129 if (!_can_be_statically_bound && h_m->is_private())
130 _can_be_statically_bound = true;
131 if (_can_be_statically_bound && h_m->is_abstract())
132 _can_be_statically_bound = false;
133
134 // generating _signature may allow GC and therefore move m.
135 // These fields are always filled in.
136 _name = env->get_symbol(h_m->name());
137 ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
138 constantPoolHandle cpool(Thread::current(), h_m->constants());
139 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
140 _method_data = NULL;
141 _nmethod_age = h_m->nmethod_age();
142 // Take a snapshot of these values, so they will be commensurate with the MDO.
143 if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
144 int invcnt = h_m->interpreter_invocation_count();
145 // if the value overflowed report it as max int
146 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
147 _interpreter_throwout_count = h_m->interpreter_throwout_count();
148 } else {
149 _interpreter_invocation_count = 0;
150 _interpreter_throwout_count = 0;
151 }
152 if (_interpreter_invocation_count == 0)
153 _interpreter_invocation_count = 1;
154 _instructions_size = -1;
155 #ifdef ASSERT
156 if (ReplayCompiles) {
157 ciReplay::initialize(this);
158 }
159 #endif
160
161 CompilerOracle::tag_blackhole_if_possible(h_m);
162 }
163
164
165 // ------------------------------------------------------------------
166 // ciMethod::ciMethod
167 //
168 // Unloaded method.
169 ciMethod::ciMethod(ciInstanceKlass* holder,
170 ciSymbol* name,
171 ciSymbol* signature,
172 ciInstanceKlass* accessor) :
173 ciMetadata((Metadata*)NULL),
174 _name( name),
175 _holder( holder),
176 _method_data( NULL),
177 _method_blocks( NULL),
178 _intrinsic_id( vmIntrinsics::_none),
179 _instructions_size(-1),
180 _can_be_statically_bound(false),
181 _can_omit_stack_trace(true),
182 _liveness( NULL)
183 #if defined(COMPILER2)
184 ,
185 _flow( NULL),
186 _bcea( NULL)
187 #endif // COMPILER2
188 {
189 // Usually holder and accessor are the same type but in some cases
190 // the holder has the wrong class loader (e.g. invokedynamic call
191 // sites) so we pass the accessor.
192 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
193 }
194
195
196 // ------------------------------------------------------------------
197 // ciMethod::load_code
198 //
199 // Load the bytecodes and exception handler table for this method.
200 void ciMethod::load_code() {
201 VM_ENTRY_MARK;
202 assert(is_loaded(), "only loaded methods have code");
203
204 Method* me = get_Method();
205 Arena* arena = CURRENT_THREAD_ENV->arena();
206
207 // Load the bytecodes.
208 _code = (address)arena->Amalloc(code_size());
209 memcpy(_code, me->code_base(), code_size());
210
211 #if INCLUDE_JVMTI
212 // Revert any breakpoint bytecodes in ci's copy
213 if (me->number_of_breakpoints() > 0) {
214 BreakpointInfo* bp = me->method_holder()->breakpoints();
215 for (; bp != NULL; bp = bp->next()) {
216 if (bp->match(me)) {
217 code_at_put(bp->bci(), bp->orig_bytecode());
218 }
219 }
220 }
221 #endif
222
223 // And load the exception table.
224 ExceptionTable exc_table(me);
225
226 // Allocate one extra spot in our list of exceptions. This
227 // last entry will be used to represent the possibility that
228 // an exception escapes the method. See ciExceptionHandlerStream
229 // for details.
230 _exception_handlers =
231 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
232 * (_handler_count + 1));
233 if (_handler_count > 0) {
234 for (int i=0; i<_handler_count; i++) {
235 _exception_handlers[i] = new (arena) ciExceptionHandler(
236 holder(),
237 /* start */ exc_table.start_pc(i),
238 /* limit */ exc_table.end_pc(i),
239 /* goto pc */ exc_table.handler_pc(i),
240 /* cp index */ exc_table.catch_type_index(i));
241 }
242 }
243
244 // Put an entry at the end of our list to represent the possibility
245 // of exceptional exit.
246 _exception_handlers[_handler_count] =
247 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
248
249 if (CIPrintMethodCodes) {
250 print_codes();
251 }
252 }
253
254
255 // ------------------------------------------------------------------
256 // ciMethod::has_linenumber_table
257 //
258 // length unknown until decompression
259 bool ciMethod::has_linenumber_table() const {
260 check_is_loaded();
261 VM_ENTRY_MARK;
262 return get_Method()->has_linenumber_table();
263 }
264
265
266 // ------------------------------------------------------------------
267 // ciMethod::line_number_from_bci
268 int ciMethod::line_number_from_bci(int bci) const {
269 check_is_loaded();
270 VM_ENTRY_MARK;
271 return get_Method()->line_number_from_bci(bci);
272 }
273
274
275 // ------------------------------------------------------------------
276 // ciMethod::vtable_index
277 //
278 // Get the position of this method's entry in the vtable, if any.
279 int ciMethod::vtable_index() {
280 check_is_loaded();
281 assert(holder()->is_linked(), "must be linked");
282 VM_ENTRY_MARK;
283 return get_Method()->vtable_index();
284 }
285
286 // ------------------------------------------------------------------
287 // ciMethod::uses_balanced_monitors
288 //
289 // Does this method use monitors in a strict stack-disciplined manner?
290 bool ciMethod::has_balanced_monitors() {
291 check_is_loaded();
292 if (_balanced_monitors) return true;
293
294 // Analyze the method to see if monitors are used properly.
295 VM_ENTRY_MARK;
296 methodHandle method(THREAD, get_Method());
297 assert(method->has_monitor_bytecodes(), "should have checked this");
298
299 // Check to see if a previous compilation computed the
300 // monitor-matching analysis.
301 if (method->guaranteed_monitor_matching()) {
302 _balanced_monitors = true;
303 return true;
304 }
305
306 {
307 ExceptionMark em(THREAD);
308 ResourceMark rm(THREAD);
309 GeneratePairingInfo gpi(method);
310 if (!gpi.compute_map(THREAD)) {
311 fatal("Unrecoverable verification or out-of-memory error");
312 }
313 if (!gpi.monitor_safe()) {
314 return false;
315 }
316 method->set_guaranteed_monitor_matching();
317 _balanced_monitors = true;
318 }
319 return true;
320 }
321
322
323 // ------------------------------------------------------------------
324 // ciMethod::get_flow_analysis
325 ciTypeFlow* ciMethod::get_flow_analysis() {
326 #if defined(COMPILER2)
327 if (_flow == NULL) {
328 ciEnv* env = CURRENT_ENV;
329 _flow = new (env->arena()) ciTypeFlow(env, this);
330 _flow->do_flow();
331 }
332 return _flow;
333 #else // COMPILER2
334 ShouldNotReachHere();
335 return NULL;
336 #endif // COMPILER2
337 }
338
339
340 // ------------------------------------------------------------------
341 // ciMethod::get_osr_flow_analysis
342 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
343 #if defined(COMPILER2)
344 // OSR entry points are always place after a call bytecode of some sort
345 assert(osr_bci >= 0, "must supply valid OSR entry point");
346 ciEnv* env = CURRENT_ENV;
347 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
348 flow->do_flow();
349 return flow;
350 #else // COMPILER2
351 ShouldNotReachHere();
352 return NULL;
353 #endif // COMPILER2
354 }
355
356 // ------------------------------------------------------------------
357 // ciMethod::raw_liveness_at_bci
358 //
359 // Which local variables are live at a specific bci?
360 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
361 check_is_loaded();
362 if (_liveness == NULL) {
363 // Create the liveness analyzer.
364 Arena* arena = CURRENT_ENV->arena();
365 _liveness = new (arena) MethodLiveness(arena, this);
366 _liveness->compute_liveness();
367 }
368 return _liveness->get_liveness_at(bci);
369 }
370
371 // ------------------------------------------------------------------
372 // ciMethod::liveness_at_bci
373 //
374 // Which local variables are live at a specific bci? When debugging
375 // will return true for all locals in some cases to improve debug
376 // information.
377 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
378 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
379 // Keep all locals live for the user's edification and amusement.
380 MethodLivenessResult result(_max_locals);
381 result.set_range(0, _max_locals);
382 result.set_is_valid();
383 return result;
384 }
385 return raw_liveness_at_bci(bci);
386 }
387
388 // ciMethod::live_local_oops_at_bci
389 //
390 // find all the live oops in the locals array for a particular bci
391 // Compute what the interpreter believes by using the interpreter
392 // oopmap generator. This is used as a double check during osr to
393 // guard against conservative result from MethodLiveness making us
394 // think a dead oop is live. MethodLiveness is conservative in the
395 // sense that it may consider locals to be live which cannot be live,
396 // like in the case where a local could contain an oop or a primitive
397 // along different paths. In that case the local must be dead when
398 // those paths merge. Since the interpreter's viewpoint is used when
399 // gc'ing an interpreter frame we need to use its viewpoint during
400 // OSR when loading the locals.
401
402 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
403 VM_ENTRY_MARK;
404 InterpreterOopMap mask;
405 OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
406 int mask_size = max_locals();
407 ResourceBitMap result(mask_size);
408 int i;
409 for (i = 0; i < mask_size ; i++ ) {
410 if (mask.is_oop(i)) result.set_bit(i);
411 }
412 return result;
413 }
414
415
416 #ifdef COMPILER1
417 // ------------------------------------------------------------------
418 // ciMethod::bci_block_start
419 //
420 // Marks all bcis where a new basic block starts
421 const BitMap& ciMethod::bci_block_start() {
422 check_is_loaded();
423 if (_liveness == NULL) {
424 // Create the liveness analyzer.
425 Arena* arena = CURRENT_ENV->arena();
426 _liveness = new (arena) MethodLiveness(arena, this);
427 _liveness->compute_liveness();
428 }
429
430 return _liveness->get_bci_block_start();
431 }
432 #endif // COMPILER1
433
434
435 // ------------------------------------------------------------------
436 // ciMethod::check_overflow
437 //
438 // Check whether the profile counter is overflowed and adjust if true.
439 // For invoke* it will turn negative values into max_jint,
440 // and for checkcast/aastore/instanceof turn positive values into min_jint.
441 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
442 switch (code) {
443 case Bytecodes::_aastore: // fall-through
444 case Bytecodes::_checkcast: // fall-through
445 case Bytecodes::_instanceof: {
446 return (c > 0 ? min_jint : c); // always non-positive
447 }
448 default: {
449 assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
450 return (c < 0 ? max_jint : c); // always non-negative
451 }
452 }
453 }
454
455
456 // ------------------------------------------------------------------
457 // ciMethod::call_profile_at_bci
458 //
459 // Get the ciCallProfile for the invocation of this method.
460 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
461 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
462 ResourceMark rm;
463 ciCallProfile result;
464 if (method_data() != NULL && method_data()->is_mature()) {
465 ciProfileData* data = method_data()->bci_to_data(bci);
466 if (data != NULL && data->is_CounterData()) {
467 // Every profiled call site has a counter.
468 int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
469
470 if (!data->is_ReceiverTypeData()) {
471 result._receiver_count[0] = 0; // that's a definite zero
472 } else { // ReceiverTypeData is a subclass of CounterData
473 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
474 // In addition, virtual call sites have receiver type information
475 int receivers_count_total = 0;
476 int morphism = 0;
477 // Precompute morphism for the possible fixup
478 for (uint i = 0; i < call->row_limit(); i++) {
479 ciKlass* receiver = call->receiver(i);
480 if (receiver == NULL) continue;
481 morphism++;
482 }
483 int epsilon = 0;
484 // For a call, it is assumed that either the type of the receiver(s)
485 // is recorded or an associated counter is incremented, but not both. With
486 // tiered compilation, however, both can happen due to the interpreter and
487 // C1 profiling invocations differently. Address that inconsistency here.
488 if (morphism == 1 && count > 0) {
489 epsilon = count;
490 count = 0;
491 }
492 for (uint i = 0; i < call->row_limit(); i++) {
493 ciKlass* receiver = call->receiver(i);
494 if (receiver == NULL) continue;
495 int rcount = saturated_add(call->receiver_count(i), epsilon);
496 if (rcount == 0) rcount = 1; // Should be valid value
497 receivers_count_total = saturated_add(receivers_count_total, rcount);
498 // Add the receiver to result data.
499 result.add_receiver(receiver, rcount);
500 // If we extend profiling to record methods,
501 // we will set result._method also.
502 }
503 // Determine call site's morphism.
504 // The call site count is 0 with known morphism (only 1 or 2 receivers)
505 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
506 // The call site count is > 0 in the case of a polymorphic virtual call.
507 if (morphism > 0 && morphism == result._limit) {
508 // The morphism <= MorphismLimit.
509 if ((morphism < ciCallProfile::MorphismLimit) ||
510 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
511 #ifdef ASSERT
512 if (count > 0) {
513 this->print_short_name(tty);
514 tty->print_cr(" @ bci:%d", bci);
515 this->print_codes();
516 assert(false, "this call site should not be polymorphic");
517 }
518 #endif
519 result._morphism = morphism;
520 }
521 }
522 // Make the count consistent if this is a call profile. If count is
523 // zero or less, presume that this is a typecheck profile and
524 // do nothing. Otherwise, increase count to be the sum of all
525 // receiver's counts.
526 if (count >= 0) {
527 count = saturated_add(count, receivers_count_total);
528 }
529 }
530 result._count = count;
531 }
532 }
533 return result;
534 }
535
536 // ------------------------------------------------------------------
537 // Add new receiver and sort data by receiver's profile count.
538 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
539 // Add new receiver and sort data by receiver's counts when we have space
540 // for it otherwise replace the less called receiver (less called receiver
541 // is placed to the last array element which is not used).
542 // First array's element contains most called receiver.
543 int i = _limit;
544 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
545 _receiver[i] = _receiver[i-1];
546 _receiver_count[i] = _receiver_count[i-1];
547 }
548 _receiver[i] = receiver;
549 _receiver_count[i] = receiver_count;
550 if (_limit < MorphismLimit) _limit++;
551 }
552
553
554 void ciMethod::assert_virtual_call_type_ok(int bci) {
555 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
556 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
557 }
558
559 void ciMethod::assert_call_type_ok(int bci) {
560 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
561 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
562 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
563 }
564
565 /**
566 * Check whether profiling provides a type for the argument i to the
567 * call at bci bci
568 *
569 * @param [in]bci bci of the call
570 * @param [in]i argument number
571 * @param [out]type profiled type of argument, NULL if none
572 * @param [out]ptr_kind whether always null, never null or maybe null
573 * @return true if profiling exists
574 *
575 */
576 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
577 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
578 ciProfileData* data = method_data()->bci_to_data(bci);
579 if (data != NULL) {
580 if (data->is_VirtualCallTypeData()) {
581 assert_virtual_call_type_ok(bci);
582 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
583 if (i >= call->number_of_arguments()) {
584 return false;
585 }
586 type = call->valid_argument_type(i);
587 ptr_kind = call->argument_ptr_kind(i);
588 return true;
589 } else if (data->is_CallTypeData()) {
590 assert_call_type_ok(bci);
591 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
592 if (i >= call->number_of_arguments()) {
593 return false;
594 }
595 type = call->valid_argument_type(i);
596 ptr_kind = call->argument_ptr_kind(i);
597 return true;
598 }
599 }
600 }
601 return false;
602 }
603
604 /**
605 * Check whether profiling provides a type for the return value from
606 * the call at bci bci
607 *
608 * @param [in]bci bci of the call
609 * @param [out]type profiled type of argument, NULL if none
610 * @param [out]ptr_kind whether always null, never null or maybe null
611 * @return true if profiling exists
612 *
613 */
614 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
615 if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
616 ciProfileData* data = method_data()->bci_to_data(bci);
617 if (data != NULL) {
618 if (data->is_VirtualCallTypeData()) {
619 assert_virtual_call_type_ok(bci);
620 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
621 if (call->has_return()) {
622 type = call->valid_return_type();
623 ptr_kind = call->return_ptr_kind();
624 return true;
625 }
626 } else if (data->is_CallTypeData()) {
627 assert_call_type_ok(bci);
628 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
629 if (call->has_return()) {
630 type = call->valid_return_type();
631 ptr_kind = call->return_ptr_kind();
632 }
633 return true;
634 }
635 }
636 }
637 return false;
638 }
639
640 /**
641 * Check whether profiling provides a type for the parameter i
642 *
643 * @param [in]i parameter number
644 * @param [out]type profiled type of parameter, NULL if none
645 * @param [out]ptr_kind whether always null, never null or maybe null
646 * @return true if profiling exists
647 *
648 */
649 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
650 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
651 ciParametersTypeData* parameters = method_data()->parameters_type_data();
652 if (parameters != NULL && i < parameters->number_of_parameters()) {
653 type = parameters->valid_parameter_type(i);
654 ptr_kind = parameters->parameter_ptr_kind(i);
655 return true;
656 }
657 }
658 return false;
659 }
660
661
662 // ------------------------------------------------------------------
663 // ciMethod::find_monomorphic_target
664 //
665 // Given a certain calling environment, find the monomorphic target
666 // for the call. Return NULL if the call is not monomorphic in
667 // its calling environment, or if there are only abstract methods.
668 // The returned method is never abstract.
669 // Note: If caller uses a non-null result, it must inform dependencies
670 // via assert_unique_concrete_method or assert_leaf_type.
671 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
672 ciInstanceKlass* callee_holder,
673 ciInstanceKlass* actual_recv,
674 bool check_access) {
675 check_is_loaded();
676
677 if (actual_recv->is_interface()) {
678 // %%% We cannot trust interface types, yet. See bug 6312651.
679 return NULL;
680 }
681
682 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
683 if (root_m == NULL) {
684 // Something went wrong looking up the actual receiver method.
685 return NULL;
686 }
687
688 // Make certain quick checks even if UseCHA is false.
689
690 // Is it private or final?
691 if (root_m->can_be_statically_bound()) {
692 assert(!root_m->is_abstract(), "sanity");
693 return root_m;
694 }
695
696 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
697 // Easy case. There is no other place to put a method, so don't bother
698 // to go through the VM_ENTRY_MARK and all the rest.
699 if (root_m->is_abstract()) {
700 return NULL;
701 }
702 return root_m;
703 }
704
705 // Array methods (clone, hashCode, etc.) are always statically bound.
706 // If we were to see an array type here, we'd return root_m.
707 // However, this method processes only ciInstanceKlasses. (See 4962591.)
708 // The inline_native_clone intrinsic narrows Object to T[] properly,
709 // so there is no need to do the same job here.
710
711 if (!UseCHA) return NULL;
712
713 VM_ENTRY_MARK;
714
715 methodHandle target;
716 {
717 MutexLocker locker(Compile_lock);
718 InstanceKlass* context = actual_recv->get_instanceKlass();
719 if (UseVtableBasedCHA) {
720 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
721 root_m->get_Method(),
722 callee_holder->get_Klass(),
723 this->get_Method()));
724 } else {
725 if (root_m->is_abstract()) {
726 return NULL; // not supported
727 }
728 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context, root_m->get_Method()));
729 }
730 assert(target() == NULL || !target()->is_abstract(), "not allowed");
731 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
732 }
733
734 #ifndef PRODUCT
735 if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
736 tty->print("found a non-root unique target method");
737 tty->print_cr(" context = %s", actual_recv->get_Klass()->external_name());
738 tty->print(" method = ");
739 target->print_short_name(tty);
740 tty->cr();
741 }
742 #endif //PRODUCT
743
744 if (target() == NULL) {
745 return NULL;
746 }
747 if (target() == root_m->get_Method()) {
748 return root_m;
749 }
750 if (!root_m->is_public() &&
751 !root_m->is_protected()) {
752 // If we are going to reason about inheritance, it's easiest
753 // if the method in question is public, protected, or private.
754 // If the answer is not root_m, it is conservatively correct
755 // to return NULL, even if the CHA encountered irrelevant
756 // methods in other packages.
757 // %%% TO DO: Work out logic for package-private methods
758 // with the same name but different vtable indexes.
759 return NULL;
760 }
761 return CURRENT_THREAD_ENV->get_method(target());
762 }
763
764 // ------------------------------------------------------------------
765 // ciMethod::can_be_statically_bound
766 //
767 // Tries to determine whether a method can be statically bound in some context.
768 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
769 return (holder() == context) && can_be_statically_bound();
770 }
771
772 // ------------------------------------------------------------------
773 // ciMethod::can_omit_stack_trace
774 //
775 // Tries to determine whether a method can omit stack trace in throw in compiled code.
776 bool ciMethod::can_omit_stack_trace() const {
777 if (!StackTraceInThrowable) {
778 return true; // stack trace is switched off.
779 }
780 if (!OmitStackTraceInFastThrow) {
781 return false; // Have to provide stack trace.
782 }
783 return _can_omit_stack_trace;
784 }
785
786 // ------------------------------------------------------------------
787 // ciMethod::resolve_invoke
788 //
789 // Given a known receiver klass, find the target for the call.
790 // Return NULL if the call has no target or the target is abstract.
791 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
792 check_is_loaded();
793 VM_ENTRY_MARK;
794
795 Klass* caller_klass = caller->get_Klass();
796 Klass* recv = exact_receiver->get_Klass();
797 Klass* resolved = holder()->get_Klass();
798 Symbol* h_name = name()->get_symbol();
799 Symbol* h_signature = signature()->get_symbol();
800
801 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
802 check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
803 check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
804 Method* m = NULL;
805 // Only do exact lookup if receiver klass has been linked. Otherwise,
806 // the vtable has not been setup, and the LinkResolver will fail.
807 if (recv->is_array_klass()
808 ||
809 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
810 if (holder()->is_interface()) {
811 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
812 } else {
813 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
814 }
815 }
816
817 if (m == NULL) {
818 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
819 return NULL;
820 }
821
822 ciMethod* result = this;
823 if (m != get_Method()) {
824 result = CURRENT_THREAD_ENV->get_method(m);
825 }
826
827 if (result->is_abstract() && !allow_abstract) {
828 // Don't return abstract methods because they aren't optimizable or interesting.
829 return NULL;
830 }
831 return result;
832 }
833
834 // ------------------------------------------------------------------
835 // ciMethod::resolve_vtable_index
836 //
837 // Given a known receiver klass, find the vtable index for the call.
838 // Return Method::invalid_vtable_index if the vtable_index is unknown.
839 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
840 check_is_loaded();
841
842 int vtable_index = Method::invalid_vtable_index;
843 // Only do lookup if receiver klass has been linked. Otherwise,
844 // the vtable has not been setup, and the LinkResolver will fail.
845 if (!receiver->is_interface()
846 && (!receiver->is_instance_klass() ||
847 receiver->as_instance_klass()->is_linked())) {
848 VM_ENTRY_MARK;
849
850 Klass* caller_klass = caller->get_Klass();
851 Klass* recv = receiver->get_Klass();
852 Symbol* h_name = name()->get_symbol();
853 Symbol* h_signature = signature()->get_symbol();
854
855 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
856 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
857 if (vtable_index == Method::nonvirtual_vtable_index) {
858 // A statically bound method. Return "no such index".
859 vtable_index = Method::invalid_vtable_index;
860 }
861 }
862
863 return vtable_index;
864 }
865
866 // ------------------------------------------------------------------
867 // ciMethod::get_field_at_bci
868 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
869 ciBytecodeStream iter(this);
870 iter.reset_to_bci(bci);
871 iter.next();
872 return iter.get_field(will_link);
873 }
874
875 // ------------------------------------------------------------------
876 // ciMethod::get_method_at_bci
877 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
878 ciBytecodeStream iter(this);
879 iter.reset_to_bci(bci);
880 iter.next();
881 return iter.get_method(will_link, declared_signature);
882 }
883
884 // ------------------------------------------------------------------
885 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
886 ciBytecodeStream iter(this);
887 iter.reset_to_bci(bci);
888 iter.next();
889 return iter.get_declared_method_holder();
890 }
891
892 // ------------------------------------------------------------------
893 // Adjust a CounterData count to be commensurate with
894 // interpreter_invocation_count. If the MDO exists for
895 // only 25% of the time the method exists, then the
896 // counts in the MDO should be scaled by 4X, so that
897 // they can be usefully and stably compared against the
898 // invocation counts in methods.
899 int ciMethod::scale_count(int count, float prof_factor) {
900 if (count > 0 && method_data() != NULL) {
901 int counter_life = method_data()->invocation_count();
902 int method_life = interpreter_invocation_count();
903 if (method_life < counter_life) { // may happen because of the snapshot timing
904 method_life = counter_life;
905 }
906 if (counter_life > 0) {
907 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
908 count = (count > 0) ? count : 1;
909 } else {
910 count = 1;
911 }
912 }
913 return count;
914 }
915
916
917 // ------------------------------------------------------------------
918 // ciMethod::is_special_get_caller_class_method
919 //
920 bool ciMethod::is_ignored_by_security_stack_walk() const {
921 check_is_loaded();
922 VM_ENTRY_MARK;
923 return get_Method()->is_ignored_by_security_stack_walk();
924 }
925
926 // ------------------------------------------------------------------
927 // ciMethod::needs_clinit_barrier
928 //
929 bool ciMethod::needs_clinit_barrier() const {
930 check_is_loaded();
931 return is_static() && !holder()->is_initialized();
932 }
933
934 // ------------------------------------------------------------------
935 // invokedynamic support
936
937 // ------------------------------------------------------------------
938 // ciMethod::is_method_handle_intrinsic
939 //
940 // Return true if the method is an instance of the JVM-generated
941 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
942 bool ciMethod::is_method_handle_intrinsic() const {
943 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
944 return (MethodHandles::is_signature_polymorphic(iid) &&
945 MethodHandles::is_signature_polymorphic_intrinsic(iid));
946 }
947
948 // ------------------------------------------------------------------
949 // ciMethod::is_compiled_lambda_form
950 //
951 // Return true if the method is a generated MethodHandle adapter.
952 // These are built by Java code.
953 bool ciMethod::is_compiled_lambda_form() const {
954 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
955 return iid == vmIntrinsics::_compiledLambdaForm;
956 }
957
958 // ------------------------------------------------------------------
959 // ciMethod::is_object_initializer
960 //
961 bool ciMethod::is_object_initializer() const {
962 return name() == ciSymbols::object_initializer_name();
963 }
964
965 // ------------------------------------------------------------------
966 // ciMethod::has_member_arg
967 //
968 // Return true if the method is a linker intrinsic like _linkToVirtual.
969 // These are built by the JVM.
970 bool ciMethod::has_member_arg() const {
971 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
972 return (MethodHandles::is_signature_polymorphic(iid) &&
973 MethodHandles::has_member_arg(iid));
974 }
975
976 // ------------------------------------------------------------------
977 // ciMethod::ensure_method_data
978 //
979 // Generate new MethodData* objects at compile time.
980 // Return true if allocation was successful or no MDO is required.
981 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
982 EXCEPTION_CONTEXT;
983 if (is_native() || is_abstract() || h_m()->is_accessor()) {
984 return true;
985 }
986 if (h_m()->method_data() == NULL) {
987 Method::build_interpreter_method_data(h_m, THREAD);
988 if (HAS_PENDING_EXCEPTION) {
989 CLEAR_PENDING_EXCEPTION;
990 }
991 }
992 if (h_m()->method_data() != NULL) {
993 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
994 return _method_data->load_data();
995 } else {
996 _method_data = CURRENT_ENV->get_empty_methodData();
997 return false;
998 }
999 }
1000
1001 // public, retroactive version
1002 bool ciMethod::ensure_method_data() {
1003 bool result = true;
1004 if (_method_data == NULL || _method_data->is_empty()) {
1005 GUARDED_VM_ENTRY({
1006 methodHandle mh(Thread::current(), get_Method());
1007 result = ensure_method_data(mh);
1008 });
1009 }
1010 return result;
1011 }
1012
1013
1014 // ------------------------------------------------------------------
1015 // ciMethod::method_data
1016 //
1017 ciMethodData* ciMethod::method_data() {
1018 if (_method_data != NULL) {
1019 return _method_data;
1020 }
1021 VM_ENTRY_MARK;
1022 ciEnv* env = CURRENT_ENV;
1023 Thread* my_thread = JavaThread::current();
1024 methodHandle h_m(my_thread, get_Method());
1025
1026 if (h_m()->method_data() != NULL) {
1027 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1028 _method_data->load_data();
1029 } else {
1030 _method_data = CURRENT_ENV->get_empty_methodData();
1031 }
1032 return _method_data;
1033
1034 }
1035
1036 // ------------------------------------------------------------------
1037 // ciMethod::method_data_or_null
1038 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1039 // NULL otherwise.
1040 ciMethodData* ciMethod::method_data_or_null() {
1041 ciMethodData *md = method_data();
1042 if (md->is_empty()) {
1043 return NULL;
1044 }
1045 return md;
1046 }
1047
1048 // ------------------------------------------------------------------
1049 // ciMethod::ensure_method_counters
1050 //
1051 MethodCounters* ciMethod::ensure_method_counters() {
1052 check_is_loaded();
1053 VM_ENTRY_MARK;
1054 methodHandle mh(THREAD, get_Method());
1055 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1056 return method_counters;
1057 }
1058
1059 // ------------------------------------------------------------------
1060 // ciMethod::has_option
1061 //
1062 bool ciMethod::has_option(enum CompileCommand option) {
1063 check_is_loaded();
1064 VM_ENTRY_MARK;
1065 methodHandle mh(THREAD, get_Method());
1066 return CompilerOracle::has_option(mh, option);
1067 }
1068
1069 // ------------------------------------------------------------------
1070 // ciMethod::has_option_value
1071 //
1072 bool ciMethod::has_option_value(enum CompileCommand option, double& value) {
1073 check_is_loaded();
1074 VM_ENTRY_MARK;
1075 methodHandle mh(THREAD, get_Method());
1076 return CompilerOracle::has_option_value(mh, option, value);
1077 }
1078 // ------------------------------------------------------------------
1079 // ciMethod::can_be_compiled
1080 //
1081 // Have previous compilations of this method succeeded?
1082 bool ciMethod::can_be_compiled() {
1083 check_is_loaded();
1084 ciEnv* env = CURRENT_ENV;
1085 if (is_c1_compile(env->comp_level())) {
1086 return _is_c1_compilable;
1087 }
1088 return _is_c2_compilable;
1089 }
1090
1091 // ------------------------------------------------------------------
1092 // ciMethod::has_compiled_code
1093 bool ciMethod::has_compiled_code() {
1094 return instructions_size() > 0;
1095 }
1096
1097 int ciMethod::highest_osr_comp_level() {
1098 check_is_loaded();
1099 VM_ENTRY_MARK;
1100 return get_Method()->highest_osr_comp_level();
1101 }
1102
1103 // ------------------------------------------------------------------
1104 // ciMethod::code_size_for_inlining
1105 //
1106 // Code size for inlining decisions. This method returns a code
1107 // size of 1 for methods which has the ForceInline annotation.
1108 int ciMethod::code_size_for_inlining() {
1109 check_is_loaded();
1110 if (get_Method()->force_inline()) {
1111 return 1;
1112 }
1113 return code_size();
1114 }
1115
1116 // ------------------------------------------------------------------
1117 // ciMethod::instructions_size
1118 //
1119 // This is a rough metric for "fat" methods, compared before inlining
1120 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1121 // junk like exception handler, stubs, and constant table, which are
1122 // not highly relevant to an inlined method. So we use the more
1123 // specific accessor nmethod::insts_size.
1124 int ciMethod::instructions_size() {
1125 if (_instructions_size == -1) {
1126 GUARDED_VM_ENTRY(
1127 CompiledMethod* code = get_Method()->code();
1128 if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1129 _instructions_size = code->insts_end() - code->verified_entry_point();
1130 } else {
1131 _instructions_size = 0;
1132 }
1133 );
1134 }
1135 return _instructions_size;
1136 }
1137
1138 // ------------------------------------------------------------------
1139 // ciMethod::log_nmethod_identity
1140 void ciMethod::log_nmethod_identity(xmlStream* log) {
1141 GUARDED_VM_ENTRY(
1142 CompiledMethod* code = get_Method()->code();
1143 if (code != NULL) {
1144 code->log_identity(log);
1145 }
1146 )
1147 }
1148
1149 // ------------------------------------------------------------------
1150 // ciMethod::is_not_reached
1151 bool ciMethod::is_not_reached(int bci) {
1152 check_is_loaded();
1153 VM_ENTRY_MARK;
1154 return Interpreter::is_not_reached(
1155 methodHandle(THREAD, get_Method()), bci);
1156 }
1157
1158 // ------------------------------------------------------------------
1159 // ciMethod::was_never_executed
1160 bool ciMethod::was_executed_more_than(int times) {
1161 VM_ENTRY_MARK;
1162 return get_Method()->was_executed_more_than(times);
1163 }
1164
1165 // ------------------------------------------------------------------
1166 // ciMethod::has_unloaded_classes_in_signature
1167 bool ciMethod::has_unloaded_classes_in_signature() {
1168 VM_ENTRY_MARK;
1169 {
1170 ExceptionMark em(THREAD);
1171 methodHandle m(THREAD, get_Method());
1172 bool has_unloaded = Method::has_unloaded_classes_in_signature(m, thread);
1173 if( HAS_PENDING_EXCEPTION ) {
1174 CLEAR_PENDING_EXCEPTION;
1175 return true; // Declare that we may have unloaded classes
1176 }
1177 return has_unloaded;
1178 }
1179 }
1180
1181 // ------------------------------------------------------------------
1182 // ciMethod::is_klass_loaded
1183 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1184 VM_ENTRY_MARK;
1185 return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1186 }
1187
1188 // ------------------------------------------------------------------
1189 // ciMethod::check_call
1190 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1191 // This method is used only in C2 from InlineTree::ok_to_inline,
1192 // and is only used under -Xcomp.
1193 // It appears to fail when applied to an invokeinterface call site.
1194 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1195 VM_ENTRY_MARK;
1196 {
1197 ExceptionMark em(THREAD);
1198 HandleMark hm(THREAD);
1199 constantPoolHandle pool (THREAD, get_Method()->constants());
1200 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1201 Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1202 if (HAS_PENDING_EXCEPTION) {
1203 CLEAR_PENDING_EXCEPTION;
1204 return false;
1205 } else {
1206 return (spec_method->is_static() == is_static);
1207 }
1208 }
1209 return false;
1210 }
1211
1212 // ------------------------------------------------------------------
1213 // ciMethod::profile_aging
1214 //
1215 // Should the method be compiled with an age counter?
1216 bool ciMethod::profile_aging() const {
1217 return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1218 !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1219 }
1220 // ------------------------------------------------------------------
1221 // ciMethod::print_codes
1222 //
1223 // Print the bytecodes for this method.
1224 void ciMethod::print_codes_on(outputStream* st) {
1225 check_is_loaded();
1226 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1227 }
1228
1229
1230 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1231 check_is_loaded(); \
1232 VM_ENTRY_MARK; \
1233 return get_Method()->flag_accessor(); \
1234 }
1235
1236 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1237 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1238 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1239 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1240 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1241 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1242 bool ciMethod::is_empty () const { FETCH_FLAG_FROM_VM(is_empty_method); }
1243
1244 bool ciMethod::is_boxing_method() const {
1245 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1246 switch (intrinsic_id()) {
1247 case vmIntrinsics::_Boolean_valueOf:
1248 case vmIntrinsics::_Byte_valueOf:
1249 case vmIntrinsics::_Character_valueOf:
1250 case vmIntrinsics::_Short_valueOf:
1251 case vmIntrinsics::_Integer_valueOf:
1252 case vmIntrinsics::_Long_valueOf:
1253 case vmIntrinsics::_Float_valueOf:
1254 case vmIntrinsics::_Double_valueOf:
1255 return true;
1256 default:
1257 return false;
1258 }
1259 }
1260 return false;
1261 }
1262
1263 bool ciMethod::is_unboxing_method() const {
1264 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1265 switch (intrinsic_id()) {
1266 case vmIntrinsics::_booleanValue:
1267 case vmIntrinsics::_byteValue:
1268 case vmIntrinsics::_charValue:
1269 case vmIntrinsics::_shortValue:
1270 case vmIntrinsics::_intValue:
1271 case vmIntrinsics::_longValue:
1272 case vmIntrinsics::_floatValue:
1273 case vmIntrinsics::_doubleValue:
1274 return true;
1275 default:
1276 return false;
1277 }
1278 }
1279 return false;
1280 }
1281
1282 bool ciMethod::is_vector_method() const {
1283 return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1284 (intrinsic_id() != vmIntrinsics::_none);
1285 }
1286
1287 BCEscapeAnalyzer *ciMethod::get_bcea() {
1288 #ifdef COMPILER2
1289 if (_bcea == NULL) {
1290 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1291 }
1292 return _bcea;
1293 #else // COMPILER2
1294 ShouldNotReachHere();
1295 return NULL;
1296 #endif // COMPILER2
1297 }
1298
1299 ciMethodBlocks *ciMethod::get_method_blocks() {
1300 if (_method_blocks == NULL) {
1301 Arena *arena = CURRENT_ENV->arena();
1302 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1303 }
1304 return _method_blocks;
1305 }
1306
1307 #undef FETCH_FLAG_FROM_VM
1308
1309 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1310 st->print("%s %s %s",
1311 CURRENT_ENV->replay_name(method->method_holder()),
1312 method->name()->as_quoted_ascii(),
1313 method->signature()->as_quoted_ascii());
1314 }
1315
1316 void ciMethod::dump_name_as_ascii(outputStream* st) {
1317 Method* method = get_Method();
1318 dump_name_as_ascii(st, method);
1319 }
1320
1321 void ciMethod::dump_replay_data(outputStream* st) {
1322 ResourceMark rm;
1323 Method* method = get_Method();
1324 if (MethodHandles::is_signature_polymorphic_method(method)) {
1325 // ignore for now
1326 return;
1327 }
1328 MethodCounters* mcs = method->method_counters();
1329 st->print("ciMethod ");
1330 dump_name_as_ascii(st);
1331 st->print_cr(" %d %d %d %d %d",
1332 mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1333 mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1334 interpreter_invocation_count(),
1335 interpreter_throwout_count(),
1336 _instructions_size);
1337 }
1338
1339 // ------------------------------------------------------------------
1340 // ciMethod::print_codes
1341 //
1342 // Print a range of the bytecodes for this method.
1343 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1344 check_is_loaded();
1345 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1346 }
1347
1348 // ------------------------------------------------------------------
1349 // ciMethod::print_name
1350 //
1351 // Print the name of this method, including signature and some flags.
1352 void ciMethod::print_name(outputStream* st) {
1353 check_is_loaded();
1354 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1355 }
1356
1357 // ------------------------------------------------------------------
1358 // ciMethod::print_short_name
1359 //
1360 // Print the name of this method, without signature.
1361 void ciMethod::print_short_name(outputStream* st) {
1362 if (is_loaded()) {
1363 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1364 } else {
1365 // Fall back if method is not loaded.
1366 holder()->print_name_on(st);
1367 st->print("::");
1368 name()->print_symbol_on(st);
1369 if (WizardMode)
1370 signature()->as_symbol()->print_symbol_on(st);
1371 }
1372 }
1373
1374 // ------------------------------------------------------------------
1375 // ciMethod::print_impl
1376 //
1377 // Implementation of the print method.
1378 void ciMethod::print_impl(outputStream* st) {
1379 ciMetadata::print_impl(st);
1380 st->print(" name=");
1381 name()->print_symbol_on(st);
1382 st->print(" holder=");
1383 holder()->print_name_on(st);
1384 st->print(" signature=");
1385 signature()->as_symbol()->print_symbol_on(st);
1386 if (is_loaded()) {
1387 st->print(" loaded=true");
1388 st->print(" arg_size=%d", arg_size());
1389 st->print(" flags=");
1390 flags().print_member_flags(st);
1391 } else {
1392 st->print(" loaded=false");
1393 }
1394 }
1395
1396 // ------------------------------------------------------------------
1397
1398 static BasicType erase_to_word_type(BasicType bt) {
1399 if (is_subword_type(bt)) return T_INT;
1400 if (is_reference_type(bt)) return T_OBJECT;
1401 return bt;
1402 }
1403
1404 static bool basic_types_match(ciType* t1, ciType* t2) {
1405 if (t1 == t2) return true;
1406 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1407 }
1408
1409 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1410 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1411 !resolved_method->is_method_handle_intrinsic();
1412
1413 if (!invoke_through_mh_intrinsic) {
1414 // Method name & descriptor should stay the same.
1415 // Signatures may reference unloaded types and thus they may be not strictly equal.
1416 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1417 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1418
1419 return (declared_method->name()->equals(resolved_method->name())) &&
1420 (declared_signature->equals(resolved_signature));
1421 }
1422
1423 ciMethod* linker = declared_method;
1424 ciMethod* target = resolved_method;
1425 // Linkers have appendix argument which is not passed to callee.
1426 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1427 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1428 return false; // argument slot count mismatch
1429 }
1430
1431 ciSignature* linker_sig = linker->signature();
1432 ciSignature* target_sig = target->signature();
1433
1434 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1435 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1436 return false; // argument count mismatch
1437 }
1438
1439 int sbase = 0, rbase = 0;
1440 switch (linker->intrinsic_id()) {
1441 case vmIntrinsics::_linkToVirtual:
1442 case vmIntrinsics::_linkToInterface:
1443 case vmIntrinsics::_linkToSpecial: {
1444 if (target->is_static()) {
1445 return false;
1446 }
1447 if (linker_sig->type_at(0)->is_primitive_type()) {
1448 return false; // receiver should be an oop
1449 }
1450 sbase = 1; // skip receiver
1451 break;
1452 }
1453 case vmIntrinsics::_linkToStatic: {
1454 if (!target->is_static()) {
1455 return false;
1456 }
1457 break;
1458 }
1459 case vmIntrinsics::_invokeBasic: {
1460 if (target->is_static()) {
1461 if (target_sig->type_at(0)->is_primitive_type()) {
1462 return false; // receiver should be an oop
1463 }
1464 rbase = 1; // skip receiver
1465 }
1466 break;
1467 }
1468 default:
1469 break;
1470 }
1471 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1472 int arg_count = target_sig->count() - rbase;
1473 for (int i = 0; i < arg_count; i++) {
1474 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1475 return false;
1476 }
1477 }
1478 // Only check the return type if the symbolic info has non-void return type.
1479 // I.e. the return value of the resolved method can be dropped.
1480 if (!linker->return_type()->is_void() &&
1481 !basic_types_match(linker->return_type(), target->return_type())) {
1482 return false;
1483 }
1484 return true; // no mismatch found
1485 }
1486
1487 // ------------------------------------------------------------------
--- EOF ---